/**
 *    Copyright (C) 2025-present MongoDB, Inc.
 *
 *    This program is free software: you can redistribute it and/or modify
 *    it under the terms of the Server Side Public License, version 1,
 *    as published by MongoDB, Inc.
 *
 *    This program is distributed in the hope that it will be useful,
 *    but WITHOUT ANY WARRANTY; without even the implied warranty of
 *    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *    Server Side Public License for more details.
 *
 *    You should have received a copy of the Server Side Public License
 *    along with this program. If not, see
 *    <http://www.mongodb.com/licensing/server-side-public-license>.
 *
 *    As a special exception, the copyright holders give permission to link the
 *    code of portions of this program with the OpenSSL library under certain
 *    conditions as described in each individual source file and distribute
 *    linked combinations including the program with the OpenSSL library. You
 *    must comply with the Server Side Public License in all respects for
 *    all of the code used other than as permitted herein. If you modify file(s)
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 */

#include "mongo/s/change_streams/historical_placement_fetcher_impl.h"

#include "mongo/db/global_catalog/ddl/placement_history_commands_gen.h"
#include "mongo/db/sharding_environment/grid.h"
#include "mongo/util/assert_util.h"
#include "mongo/util/duration.h"

namespace mongo {

HistoricalPlacement HistoricalPlacementFetcherImpl::fetch(
    OperationContext* opCtx,
    const boost::optional<NamespaceString>& nss,
    Timestamp atClusterTime,
    bool checkIfPointInTimeIsInFuture,
    bool ignoreRemovedShards) {
    // The config server request must always have a namespace string, even if it is the empty
    // string.
    const auto targetWholeCluster = !nss.has_value() || nss->isEmpty();
    ConfigsvrGetHistoricalPlacement request(targetWholeCluster ? NamespaceString::kEmpty
                                                               : nss.value(),
                                            atClusterTime,
                                            ignoreRemovedShards);
    request.setTargetWholeCluster(targetWholeCluster);
    request.setCheckIfPointInTimeIsInFuture(checkIfPointInTimeIsInFuture);

    auto configShard = Grid::get(opCtx)->shardRegistry()->getConfigShard();
    auto remoteResponse = uassertStatusOK(
        configShard->runCommand(opCtx,
                                ReadPreferenceSetting{ReadPreference::PrimaryOnly},
                                DatabaseName::kAdmin,
                                request.toBSON(),
                                Milliseconds(defaultConfigCommandTimeoutMS.load()),
                                Shard::RetryPolicy::kIdempotentOrCursorInvalidated));
    uassertStatusOK(remoteResponse.commandStatus);

    return ConfigsvrGetHistoricalPlacementResponse::parse(
               remoteResponse.response, IDLParserContext("HistoricalPlacementFetcherImpl"))
        .getHistoricalPlacement();
}

}  // namespace mongo
